[time-nuts] WWVB Measurements

EWKehren at aol.com EWKehren at aol.com
Mon Mar 28 10:51:36 UTC 2011


Living in Miami probably as far away as possible in the continental US I  
have no problem receiving WWVB. When I moved here in 1993, 60 KHz was my main 
 reference source. I used a Tracor 599 and a HP 117 along with a 4 foot  
commercial loop. The 599 showed clearly superior performance. Later Austron  
Loran C was added. The 117 was put on the shelf because without paper it was 
not  conducive for long term tracking.When $5 Million homes where build 
directly next  to me the loop had to go, plus the homes where in the direct pass 
with the  transmitting site. Homes here are built because of code with 
concrete cinder  blocks and vertical 1" rebar every one or two feet. I did 
replace the loop  with a commercial 60 KHz ferrite rod unit that also does an 
excellent job. With  the new location of the antenna I try to peak between the 
two houses but there  is also a power transformer on a pole within a 10 
degree window. During the time  I relied on 60 KHz the 599 worked flawless and 
as soon as I have room in my lab  again I will run it against a tbolt. 
I am presently cleaning house in preparation for a next year move and it is 
 depressing to throw out stuff that at one time I  paid good money for. No  
room to move in the lab right now.
In the nineties Junghans came to Miami to do some field strength  
measurements in preparation with their product roll out. Knowing their senior  
management I had an opportunity to host them. I ended up with four Junghans MEGA  
clocks and two MEGA watches. The watches have the antenna in the leather 
watch  bands (their patent). All work well in a house with steel rebar and two  
 houses next to me in the signal pass. The same is true of the receiver  in 
my La Crosse  weather station I bought three years ago. The only way I  can 
really tell when we change daylight time and I make it a point to check the 
 following morning. With out exception they all change.
Bert Kehren
 
 
In a message dated 3/28/2011 12:11:15 A.M. Eastern Daylight Time,  
hmurray at megapathdsl.net writes:


>  Pretty much before all these switching power supplies and cpfls  etc.

Does anybody know what frequency CPFLs are using today?

I  remember that we had some (non-compact) ceiling fluorescents at work 
with  
"electronic" ballasts that were in the 50-60 KHz range.  That was 5  years 
ago.

I wonder if all that junk will eventually migrate to well  above 60 KHz to 
take advantage of the smaller magnetics and open up WWVB  again.


-- 
These are my opinions, not necessarily my  employer's.  I hate  spam.




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